Drum filter



July 26, 1938.

J. N. NEIL DRUM FILTER Filed Nov. 19, 1936 2 Sheets-Sheet l 1171151770!JbHHMNEi/L.

J. N. NEIL DRUM FILTER JulyZG, 1938.

2 Sheets-Sheet 2 Filed Nov. 19, 1936 which the wooden drainage surfaceis secured.

Patented July 26, 1938 UNITED STATES- PATENT OFFE-CE DRUM FILTER JohnNicholas Neil, Sault Ste. Marie, Ontario, Canada Application November19, 1936, Serial No. 111,732 In Canada November 27, 1935 11 Claims.

This invention'relates to drum filters for use in ore refining and moreparticularly to a means of fastening a wooden drainage surface on ametal drum. In fact theinvention may be applied as well'to theapplication of a removable wooden surface to a drum.

In the past wooden filter drums have been used. These had manydisadvantages and subsequently a metal drum with a wire drainage surfacewas proposed to replacethewooden drum. However, while the metal drum hadadvantages over the wooden drum in respect to strength and the like, ithas been found that a wooden drainage surface is very desirable. In viewof this, I propose to provide a drum filter constructed of metal havinga removable wooden drainage surface and have devised a 'novel andefficient means for detachably securing the wooden surface on the drum.

According to the invention the metallic drum is provided with aplurality of rods mounted in spaced apartrelation over the drum surfaceand spaced from the drum surface, designed to engage with a woodendrainage covering and to holdit rigidly on said drum while providing forits removal when desired. Preferably the rods are rigidly supported onthe drum by means of a Figure 3 is an enlarged fragmentary plan view ofa portion of the drum showing the manner in which the securing rods arepositioned.

Figure 4 is an enlarged fragmentary section taken through one side ofthe drum, showingthe wooden drainage surface applied thereto and onemanner'in which it maybe secured on the rods.

Figure 5 is an enlarged fragmentary section showing an alternativemanner of forming the wooden drainage surface for securing it on thedrum.

Figure 6 is an enlarged fragmentary plan view of an alternative mannerof securing the wooden drainage surface to the drum.

short conduits l3.

*snappedinto sockets. formed in the Figure '7 is an enlarged fragmentaryelevation partly in section of the alternative form shown in Figure 6,and

Figure 8 is a further alternative form of securing the rods on the drum.

Referring more particularly to the drawings, A indicates the drum filteras a whole which is formed of metal and is of a conventionalconstruction. The drum is provided with the hollow trunnions l0 throughwhich the suction pipes;,=.

ll may protrude, as shown in Figure l, the pipes being connected in anysuitable manner to the cross pipe construction [2 which communicateswith the outer surface of the'drum'through the The wooden drainagesurface is generally indicated by the letter B. 'Ihisis of aconventional form more particularly illustrated in Figure 2, beingprovided with the surface grooves l lwhich are formed substantially atan angle of 4 to the'longitudinal axis of the strip and being alsoprovided with longitudinal drainage channels l5. Likewise, as clearlyshown in Figure 4, they are'formed with transverse drainage channels l6and IT.

To secure this woodendrainage surface upon the drum I provide the drumwith a series of longitudinally'extending ribs or division strips l8which extend substantially from one end of the drum to the other and, asshown in Figure 2, these strips are preferably secured on the drum 1 bywelding as at I9 and are spaced apart circumferentially of the drum. Thedivision strips or ribs l8 may be of any suitable form and provide ageneral means in all instances of mounting the rods employedfor'detachably securing the drainage surface on the drum. According tothe form of rod mounting shown particularly in Figures 2 and 3 the rods20 extend between two adjacent division strips or ribs l8 and arepreferably division strips and welded as at 2|. The rods are spacedapart from each other longitudinally of .the drumand between each pairof division strips circumferentially of the drum similar rods arepositioned, preferably in alignment with the rods extending between eachadjacent pair of division strips so that the drum has in effect aplurality of circumferentially extending rods spaced apart over itssurface and spaced from the surface. In other words, it is provided'witha skeleton framework of rods extending between each adjacent ribandconnected to the ribs intermediate their height.

The wooden drainage surface is preferably applied in relatively narrowsections, one of which is indicated at C in Figure 2 in full lines, and

these sections are secured on the rods and thus upon the surface of thedrum by means of grooves 22 extending laterally from and intersectingthe drainage channels [6, as shown in Figure 4. Opposed grooves areprovided so that either groove may be used as required. Preferably thesections C are of a length substantially half the length of the drum sothat a given number of sections C will cover half the area of the drumand a corresponding number will cover the other half. However, thesections may be shorter and may only cover a third or a quarter, etc. ofthe drum surface and equal numbers may be applied to cover the drumsurface in sections.

In Figure 1 I have illustrated the sections as being substantially halfthe length of the drum and to apply a strip it is laid longitudinally ofthe drum so that the drainage channels I6 fit over the spaced rods 28and the section may then be pushed or slid towards the centre of thedrum so that the rods 20 will be engaged in a groove 22 on one side ofthe drainage channel, as shown in Figure 4, and as the grooves arespaced intermediate the height of the section to register with the rods29 the section will be firmly secured on the drum surface firmlyabutting the latter. When the corresponding or opposite section has beenplaced on the drum in a similar manner and slid towards its centre itwill be secured in a corresponding manner and the ends of these sectionswill abut as at 23, see Figure 4. Thus, the drum surface will be coveredthroughout its length with the exception of a small marginal edge shownat 24' in Figure 1.

To hold the strips when they are all applied in this manner and in theirshifted position a circumferentially extending securing member or strip25 may be fastened to the drum surface at the marginal portion 24 andabutting the ends of the wooden sections. This fastener may be appliedin arcuate sections. Thus once these strips are mounted the sections arefirmly secured on the drum surface whereas when they are removed and theopposed sections are shifted longitudinally of the drum away from thecentre they are unlocked and may be readily removed.

By forming the grooves 22 on each side of the drainage channel l6 itdoes not matter whether a section is placed on the right or left handsection of the drum as either groove may be used. However, if desired,the surface drainage channels I6 may be provided with only one groovelocated on one side of the channel, as illustrated in Figure 5. Ofcourse other methods may be employed for securing the drainage coveringon the drum. Upon referring to Figures 6 and 7 it will be seen thatinstead of rigidly mounting the rods on the division strips I provide aremovable rod 25 which is designed to be threaded through a transversebore or passageway 21 in the drainage sections C, the rod protrudingslightly from the side of each end section and the protruding end of therod may be inserted in a bayonet slot 28 formed in the ribs or divisionstrips 13 so that after the rod has entered the vertical portion of themain slot the sections may be shifted towards the centre of the drum inwhich case the protruding ends of the rods will move in the horizontalportion of the bayonet slot thus to lock the covering firmly on the drumand by applying a similar looking or securing strip 25 on the ends ofthe drum as shown in Figure 1 the covering is securely held in thisshifted position.

Alternatively, instead of providing a bayonet slot, the division stripsmay be recessed as at 29,

see Figure 8, and the rods shifted in position. In any case when thecovering is mounted a series of sections extend between each pair ofdivision strips, the end sections abutting the division strips thus toprovide a complete wooden drainage covering for the drum which may bereadily removed when desired or sections of which may be readily removedand replaced.

It is notable that the securing rods engage with each section at acorresponding point and as these rods extend through a portion of thewood they act as a general reinforcement to the surface thus avoidingany tendency to warp and making it impossible for one section to reactdifferently from any other. In other words each section is provided witha common reinforcement formed by the securing rods.

Of course it will be realized that in other constructions where it isdesirable to apply a wooden surface to a drum or other construction thismethod may be readily followed. In the main, however, I am proposing ametallic drum filter formed with a practical wooden drainage surface.

Various modifications may be made in this invention without departingfrom the spirit thereof or the scope of the claims, and therefore theexact forms shown are to be taken as illustrative only and not in alimiting sense, and it is desired that only such limitations shall beplaced thereon as are disclosed in the prior art or are set forth in theaccompanying claims.

I claim:- 4

1. A drum filter comprising a metallic drum, a drainage covering ofwood, a plurality of rods on which the covering is fitted mounted inspaced apart relation over the drum surface and spaced from the drumsurface, said covering having means to mount it and to engage. itrigidly on said rods.

2. A drum filter comprising a metallic drum having a drainage coveringof wood, means for securing said covering on the drum including aplurality of rods mounted in spaced apart relation over the drum surfaceand spaced from the drum surface, said rods engaging the covering tohold it rigidly when mounted on said drum, said covering having meansslidably to engage said rods, and means to lock it on the drum surfacewhen it is shifted in one direction and to detach it from the drumsurface when it is shifted in another direction, and means mountable onsaid drum for preventing said covering from sliding out of lockedposition.

3. A drum filter comprising a metallic drum having a drainage coveringof wood formed from a plurality of sections arranged in contiguousrelation, and means for securing said covering on said drum including aplurality of metal rods on which the sections are fitted mounted inspaced apart relation over the drum surface and spaced from the drumsurface, each section having means to mount it on said rods, said rodsengaging with each section in a corresponding manner to hold themrigidly as a covering on id drum, said rods forming a reinforcement forthe covering.

4. The device as claimed in claim 3 in which the sections areindividually mountable and detachable.

5. A drum filter comprising a metallic drum having a drainage coveringof wood, means for securing said covering on said drum including aplurality of rods mounted in spaced apart relation over the drum surfaceand spaced from the drum surface, said covering being formed with aplurality of channels with laterally extending grooves intersecting saidchannels, said channels coinciding with said rods, said grooves beingpositioned to register with said rods when the covering is mounted onsaid drum with the rods in said channels, said covering being shiftablewhereby said grooves engage said rods to hold the covering rigidly onthe drum, and means mountable on said drum for preventing the coveringfrom sliding to disengage the rods from the grooves.

6. The device as claimed in claim 5, in which the covering is applied insections, there being a plurality of series of opposed sections, theends of one series of sections abutting the ends of an opposite seriesof sections when said sections are shifted to engage the rods withinsaid grooves.

7. The device as claimed in claim 5 in which laterally extending groovesare provided on each side of the channels.

8. A drum filter comprisinga metallic drum having a drainage covering ofwood made up of a plurality of contiguous sections, and means forsecuring said covering on said drum including a. plurality of ribsrigidly mounted on the drum surface, a plurality of rods mounted betweeneach pair of ribs in spaced apart relation over the drum surface andspaced from the drum surface, said sections being formed with channelspositioned to register with said rods whereby said rods lie within saidchannels and the sections are mounted on the drum, said sections havinga laterally extending groove intersecting said channels and positionedto register with said rods when the latter are positioned in saidchannels whereby said rods are engaged by said channels when thesections are shifted axially to lock them on the drum surface, certainof said sections abutting said ribs when in mounted position.

9. A drum filter comprising a metallic drum having a drainage coveringof wood made up of a plurality of contiguous sections, and means forsecuring said covering on said drum including a plurality of ribsrigidly mounted on the drum surface, each of said ribs having slotstherein, said sections being provided with a passageway therethrough,the passageway in each section being aligned with the passageway in theadjacent sections when said sections are arranged in contiguous and evenrelationship, metal rods traversing said passageways to hold a pluralityof sections together as a unit, said rods projecting from the sides ofsaid sections, the projecting ends of said rods being engageable in theslots of said ribs whereby said sections are locked on the surface ofthe drum.

10. Means for securing a wood covering on a surface comprising aplurality of wooden sections designed to form the covering, a pluralityof ribs rigidly mounted on the surface, a plurality of rods spaced apartover the surface and spaced from the surface and designed to engage withsaid ribs, said sections being formed with channels intermediate theirsides having laterally extending slots projecting therefrom, saidchannels being positioned in said sections to coincide with the positionof said rods, said slots being positioned in the channels to registerwith the rods when the latter are positioned within the channelswhereby, on shifting said sections, said slots are caused to engage therods to firmly hold the sections on the surface.

11. The device as claimed in claim 10 in which the ribs are slotted andin which the sections are provided with a passageway therethrough, thepassageway in each section being aligned with the passageway in theadjacent sections when said sections are arranged in contiguous and evenrelationship, said rods traversing said passageways to hold a pluralityof sections together as a unit, said rods projecting from the sides ofcertain sections, the projecting end of said rods being engageable inthe slots of said ribs whereby said sections are locked on the surface.

JOHN NICHOLAS NEIL;

